Rotary take-up for sewing machines



Oct. 19, 1943. J. D. KARLE ROTARY TAKE-UP FOR SEWING MACHINES Filed Feb.12, 1941 6 Sheets-Sheet l mm NQWN a N i m MN H N |l|l 2....1 l] 6% QM uww j %N mm mm 1 a 'H F W m a i- Z/ J N 0% QM Jo/zn ZZAarZe W. MN m MW g kQR mm 3 Wm. mm EN mN NR w. MQN Sn km W w Oct. 19,1943. J. D. KARLEROTARY TAKE-UP FOR SEWING MACHINES Filed Feb. 12, 1941 6 Sheets-Sheet 2John D. Karla any/mug Oct. 19, 1943.

J. D. KARLE ROTARY TAKE-UP FOR SEWING MACHINES Filed Feb. 12, 1941 6Sheets-Sheet 3 1943. J. D. KARLE 2,332,087

ROTARY TAKE-UP FOR SEWING MACHINES- Filed Feb. 12, 1941 6 Sheets-Sheet 4ail/0W John 17. Karla 3 Q 7% firm/W Oct. 19, 1943.

J. D. KARLE ROTARY TAKE-UP FOR SEWING MACHINES 6 Shee'ts-Sheet 5 FiledFeb. 12, 1941 Oct. 19, 1943. D, KARLE 2,332,087

ROTARY TAKE-UP FOR SEWING MACHINES Filed Feb. 12, 1941 6 Sheets-Sheet 6Patented Oct. 19, 1943 UNITED STATES PATENT OFFICE ROTARY TAKE-UP FORSEWING MACHINES John D. Karle, Roselle Park, N. J., assignor to TheSinger Manufacturing Company, Elizabeth, N. J, a corporation of NewJersey Application February 12, 1941, Serial No 378,496

29 Claims. (Cl. 112-248) This invention relates to thread take-ups forsewing machines. 7

In a lock-stitch sewing machine having a reciprocatory eye-pointedneedle and a complementai rotary hook and bobbin-thread-case device, itis necessary to have a needle-thread take-up having a fast take-upaction timed to occur. immediately after the rotary hook reachesneedleloop cast-01f. position. The take-up must then have acomparatively slow slack giving action as the needle descends throughthe work preparatory to the presentation of a new needle-loop to therotary hook.

A simple rotary take-up has long been recognized as having the verydesirable attribute of being perfectly balanceable for quiet,vibrationless operation at high speeds, as by the simple expedient ofadding weight, where needed, to bring it into balance. A simple rotarytake-up having a single circularly moving thread-engaging member,however, does not possess the relacompound rotary take-up having noshaft which tively fast take-up and slow slack-giving actions desired.Compound rotary take-ups have heretofore been proposed to secure thedesired fast and slow actions, such take-ups including a secondthread-engaging member movable differentially with relation to theprimary circularly moving thread-engaging member.

Of the compound rotary take-up heretofore devised with the desired fastand slow thread-handling characteristics, none has been perfectlybalanceable, except the double-disk type having two take-up elementsrotating at different speeds. While a take-up of this latter type hasthe desired fast and slow thread-handling characteristics, it requirestwo rotary shafts for its operation and one of these shafts must run inits bearings at a speed which is at least double the speed of theneedle-driving shaft of the sewing machine.

The present invention' has for an object to provide a simplified,compact and perfectly balancedtake-up which meets the fast thread takeupand slow thread-delivery requirements of highspeed lock-stitch sewingmachin operation. Another object of the invention is to provide a sewingmachine thread take-up of the compound rotary type including twoconcomitantly and differentially acting thread take-up elementsoperating in perfect balance and actuated by simplified drivingmechanism enabling the take-up to be assembled as a unit independentlyof the sewing machine and applied to or removed from the machine as aunitary assembly. A further object of the invention is to provide abalanced greater than the sewing speed of the needledriving shaft of themachine.

A still further object of the invention is to provide a take-up whichmay be quickly and easily adjustable to vary the timing of the beginningof the take-up action relative to the looptaker.

With the above and other objects in view,' as will hereinafter appear,the invention comprises the devices, combinations and arrangements ofparts hereinafter set forth and illustrated in the accompanying drawingsof .a preferred embodiment of the invention, from which the severalfeatures of the invention and the advantages attained thereby will bereadily understood by those skilled in the art.

Fig. 1 is a vertical sectional view taken through a sewing machineembodying my invention.

Fi 2 is a rear elevation of the machine shown in Fig. 1.

Fig. 3 is an enlarged sectional view taken through the head of themachine. a Fig. 4 is a head end elevation of the machine shown in Figs.1 and 2.

Fig. 5 is a section taken substantially along the line 5-5 of Fig. 4.

Fig. 6 is an inside face view of the rotating take-up elements.

Fig. 7 is a perspective view of the fan for cooling the take-upelements.

Figs. 8-16 are face views of the machine showing the position of thetake-up element during a complete stitch-forming cycle.

Figs. 17 and 18 are a top plan and front elevation, respectively, of aportion of the head of the machine with a transparent plate attachedthereto which may be used to enclose the takep.

In the embodiment of the invention selected for illustration myinvention is shown embodied in a sewing machine of the kind shown in thepatent to R. Kaier, No. 2,206,285, dated July 2, 1940.

As shown, the machine comprises a bed ill from which rises a standard llcarrying an overhanging armlZ terminating in a head 13. Journaled insuitable bearings I4 is a needle-bar actuating shaft I5 having abalance-wheel and driving pulley l6 secured to one of its ends. Securedto the shaft 15 is a bevel gear I! which meshes with the bevel gear l8carried by a vertical shaft l9 journaled in the bearings 20. The

shaft l9 carries a second gear 2| which meshes with a gear 22 fixed tothe end of the hookshaft 23 which is Journaled below the bed in thebearings 24, the hook-shaft 23 rotating twice for each rotation of theneedle-bar shaft I5. Actuated by the vertical shaft I9 is an oil-pump 25which i connected with the middle bearing H for the shaft I by a conduit28 for th purpose of supplying oil under pressure to a bore in the shaft|5. The shaft l5 also carries the eccentrics 29 and 30 which through thepltmans 3|, 32 and the usual connections imparts to the feed-dog 33 itsfour components of motion.

Fixed to the end of the shaft l5 which extends into the hollow head I3is a crank-disk 35 carrying a crank-pin 36 which is embraced by a hub 31on one end of the needle-bar link 38, the other end of the link beingoperatively connected with the vertically reciprocatory needle-bar 38 bythe pivot-stud 40. The needle-bar is journaled in the bearings 4|, 42and carries an eye-pointed needle 43 which cooperates with the rotaryhook 44, fixed to the shaft 23, in the formation of lockstitches. Themechanism described above it all old and well known and is fullydescribed in the patent to R. Kaier, No. 2,206,285, dated July 2,

1940, to which reference may be had for a more end of the bushing 45 anda member 52, secured to the presser-bar 41. For the purpose ofpreventing the presser-bar 41 from turning about itslongitudinal axis inits bearing the member 52 is formed with a rearwardly extending portion53 (Fig. 5) which extends into the slot 54 formed in the head I3. Thepresser-bar may be raised by the lifting lever 55 which is fixed to oneend of a pivot-pin 56 Journaled in the head l3 (Figs. 2, 4 and 5). Tothe end of the pivotpin 56 which extends into the hollow head |3 thereis fixed a cam 51 which is located beneath the laterally extending arm58 of the member 52. From the above it will be obvious that when thehand-lever 55 is raised the pin 58 will turn about its longitudinal axisand turn the cam so that it will engage the under side of the arm 58 andraise the presser-bar 41. The presser-bar may also be raised by othermeans herein shown as a rod extending upwardly through the bed l0 andhaving its upper end fixed to one end of the flexible cable 6| whichlies over the pulleys 62 Journaled on the arm l2. The other end of thecable extends through an aperture inone of the limbs of the Z-shapedmember 63 fixed to the presser-bar 41, there being provided a ball 84 onthe end of the cable 6|. With this construction the presser-bar may beraised and lowered by the hand-lever and the member 63 will slide alongthe cable 6|, thereby eliminating interference between the two raisingmeans for the presser-bar. The rod is operated by the pivoted lever 80'which is actuated by a kneeshift lever as shown in the Kaier patent. Themember 63 is also provided with a suitable aperture which receives therod 65 formed with a depending end 66 which acts as an edge guide forthe work. It is obvious that the guide may be adjusted laterallyrelative to the preser-foot 48 and that it may be shifted from operativeto inoperative position by simply turning the rod 65 about itslongitudinal axis.

The link-type take-up shown in the Kaier patent has been replaced bymechanism comprising a spiral gear 10 fixed to the shaft |5 which mesheswith a second spiral gear 1| fixed to one end of a shaft 12 whichextends through and is journaled in the bearing 13 carried by theoverhanging arm I2 of the machine. The shaft 12 extends through thehollow head and through a ball bearing 15 carried by the coverplate 16which is fixed to the hollow head by the screws 11. The plate 16 isformed with an aperture through which the shaft extends and around theaperture the plate 16 extends forwardly forming a sleeve-like portion 18which is embraced by a stationary sun'gear 19 fixed by a screw to theplate. From the above it will be understood that the shaft 12 extendsthrough the stationary gear 19 and is adapted to rotate relativethereto.

Fixed to the end of the shaft 12 and rotatable therewith is a disk 82carrying a ball-bearing 83, the inner race of which carries a member 84having a reduced end portion 85 which is embraced by the metal insert 88of a fiber planetgear 81 which meshes with the stationary sungear 19.The ratio of these gears is as 1 is to 1. Extending into the hollow endof the member 84 is the hub of a small disk 89. The gear 81, member 85and disk 89 operate as a unit and are rigidly clamped in assembledrelationship by a bolt 90 which extends through the hub of the disk 89,and the member 85, the threaded end of the bolt being received by a nut9| which is fixed to the metal insert 86 of the gear 81 by pins 92.Carried by the disk 89, at a distance from its axis of rotation, is athread-engaging element or stud 93 which supports a thread-guide orguard 94 (Fig. 4) which extends across the axis about which the disk, 89rotates and has the end opposite the stud 93 flared outwardly to form a.counterweight for the stud 93 and thus place the disk 89, stud 93 andguard 94 in balance.

I The large disk 82 carries two spaced threadengaging elements 96 and 91each of which is in the form of a collar and these elements are heldclamped between the outer guard disk 98 and the disk 82 by the screws 99(Fig. 4). The disk 98 is held in spaced relation to the disk 82 by theelements and 91 and the inner face of the disk 98 is in the samevertical plane as the inner face of the guard 94. The small disk-89 isset into the disk 82 so that their outer faces are in the same verticalplane. This construction affords a guiding channel I00 (Figs. 1 and 3)for the needle-thread.

To place a slight pulling action on the thread at certain points in thestitch-forming cycle the disk 98 is provided with two openings intowhich the shouldered buttons 02 and I03 are set. shown in Fig. 3 thesebuttons are formed wi a curved head in the form of a segment of a sphereand each button is constantly urged against the disk 82 by a lightspring I04. From the above it will be obvious that thread in the channel)0 will wipe between these buttons and the face of the disk 82 each timethe take-up is rotated and a slight pull on the thread will cause thebuttons to move towards the disk 98 against the action of the spring 14and thereby permit the thread to pass.

From the foregoing it will be understood that the disk 82 may be pressedonto the knurled end of the shaft 12 and the remaining parts assembledon the disk. The entire assembly is then v assaoe'r placed in operativeposition on the machine by insertin the end of the shaft 12 through theY protruding sleeve-like portion 19, ball bearing 18,

bearing 18. The thrust washer 18 and gear 1i are slipped over the end ofthe shaft as it is be ing inserted and after the parts are all in placethe disk 82 is set to theproper point for timing and the gear 1i is thenlooked in position on the shaft. It will be understood that access tothe end of the shaft 12 for the purpose of placing the gears inoperative position is had through the cover-plate 2 which is held on thetop part The lead of the needle-thread T is from the source of supply tothe thread-guide Ill, thread tension H8, check spring II8, guide 1, thechannel I between the disks 82 and 98, the guides H8, H9 and thence tothe needle. Assuming the parts to be in the position shown in Fig. 8,the needle at this point in the stitchforming cycle is in its lowestposition and the thread-controlling elements 93, 88 and 91 as well asthe button I03 control the amount of slack in the needle-thread. Whenthe machine is operated the shaft I5 rotates in a clockwise directionand through the gears 10, 1i the shaft 12 is rotated in acounterclockwise direction as viewed in Fig. 4. The disk or carrier 82,being fixed to the shaft 12, also rotates in a counterclockwisedirection and carries with it the primary take-up elements 98 and 91. Asthe disk 82 also carries the disk 89 to which is fixed the secondarytake-up element 93 the disk is rotated about the axis of the shaft 12and due to the stationary gear 19, which meshes with the gear 81 fixedto the disk 89, the disk 89 also rotates about the axis of the member88. The threadcontrolling element 93 is thus caused to execute anepithrochoidal movement.

The parts being in the position shown in Fig. 8 the first few degrees ofmotion of the needlebar shaft I5 cause the parts to assume the positionsshown in Fig. 9. In this position the needle has been slightly raised toform a loop and the hook is just entering the loop. The lead of thethread is from the guide II1 across the button I03, the controller 98and one of the primary take-up elements 81. After the loop has beentaken, as shown in Fig. 10, the controller 93 and the take-up element 91will give up thread, and as the thread is being detained by the buttonI03 some additional thread can be obtained by drawing the thread underthis button. In Fig. 11 the loop-taker has traveled about 90 passedloop-seizing position, the thread at this time having been pulled fromunder the button I08 so that it is now detained by the button I02 andthe controller 98 continues to give up thread. At this point the primarytake-up element 96 is beginning to take a small amount of thread. Fig,12 illustrates the position of the thread just before the hook of theloop-taker has reached 180. At this point of the cycle the thread hasbeen pulled from under the button I02 and is now controlled entirely bythe primary take-up element 98 which is taking up thread and thecontroller 93 which is giving up thread at this particular point of thecycle of operation. Fig. 18 represents one of the critical points in thestitch-forming cycle i. e. the point at which the needle-loop begins toslip over the beak of the hook. At this point the primary take-upelement 98 is taking up thread and the secondary element 99 continues togive up thread. The amount of thread taken up by the element 98 isslightly more than the amount given up by the controlling element 98with the result that there is a slight tightening of the thread at thispoint which causes the thread to slip along the hook-beak as shown inFig. 14.

Between the positions shown in Figs. 12 through 14 the take-up action ofpin 98 is practically balanced by the give up action of the controllerelement 98. This is the beginning of a very rapid take-up action and asillustrated the primary take-up element 98 is taking up thread and theprimary element 91 is Just engaging the thread to begin its take-upaction while the element 93 is still giving up a small quantity ofthread. Fig. 15 illustrates the position'of the parts after the loop hasleft the beak or the hook and is now on the loop-controlling tail of thehook. At this point of the cycle the primary take-up elements 98 and 91control the take-up action and the controlling element 99 has nofunction. Fig. 16 represents the stitch setting point in the cycle. Atthis point the thread is drawn taut across the two take-up elements 98and 91 which are at the peak of their take-up action and the stitch is Qset in the material. The stitch setting action is very gentle in thatthe last few degrees of movement of the take-up elements 98 and 91 pullonly a small amount of thread through the needleeyes; from this it wouldbe seen that the stitch setting action occurs slowly and gently andproperly anchors the stitch in the material.

From the foregoing it will be observed that the controller 99 does notact to set the stitch, this important function is accomplished by thetake-up elements 98 and 91. The controller 98 begins to function shortlyafter the stitch is set at which time it takes up the slack thread. Its

most important function is to give up thread when the take-up elementbegins its take-up action. This delays the time of the beginning of thetake-up action of the primary elements and reduces the time required forthe take-up action. In the present instance the take-up and stitchsetting action occurs in about 127 of motion of the take-up elements 98and 91. As the stitch setting point is not effected by the element 98 itwill be obvious that it may be adjusted to vary the beginning of thetake-up action by the elements 98 and 91 to coordinate it with thebeginning of the cast 0d of the rotary hook. This is accomplished byloosening the screw and then turning the disk 89. which carries thecontroller 98, relative to the gear 91. If it is turnedcounterclockwise, as viewed in Fig. '4, the start of the take-up of theneedle-loop will be delayed; and if it is turned in a clockwisedirection the take-up of the needle-loop will begin earlier. In this wayvariation in the machines and irregularities in the manufacture of thehook may be overcome. The timing of thetake-up elements 98 and 91 mayalso be varied. This is accomplished by loosening the set screw 1! whichfixes the gear H to the shaft 12 and then turning the disk 82 relativeto the gear 1|. This, of course, will change the relation of the take-upelements to the position of the hook 44. From the above it will be seenthat the take-up can be readily and easily adjusted to meet varyingconditions which may occur during the manufacture of the machine.

Another important feature is the rotation of the element 93 within theorbit described by the primary take-up elements 90 and 91. It will benoted that the element 93 moves towards and away from the elements 90and 91 and as the element 98 is within the orbit described by theelements 98 and 91 if the thread should break and begin to wind aboutthe elements, the motion of the element 93 towards and away from theother elements will break the needle thread and prevent it from windingabout the elements.

It will be understood that the buttons I02 and I03 serve only to take-upsurplus needlethread slack and that the take-up will operate without theuse of the buttons and consequently they are not considered to beessential'to my invention. I have shown in Figs. 17 and 18 a coveringwhich may be used to enclose parts of my improved take-up. As shown thecovering comprises a hinge I2I for pivotally securing a disk oftransparent material I22 to the plate I6. This transparent material isprovided at a point diametrically opposite the hinge with a spring catchI23 which is adapted to engage the other side of the plate I and hold itin position. It will be obvious that the disk I22 may swing about itspivot I2I to provide access to the take-u and that the needle thread maybe slipped into channel I00 between the take-up disk 82 and 98 for thepurpose of threading the take-up.

I am aware of the prior rotary take-ups of U. S. patents No. 923,031 ofMay 25, 1909, and No. 1,941,943 of Jan. 2, 1934. Each of these take-ups,however, has only one movable takeup element, as distinguished from twotake-up elements movable differentially relative to each other, as inthe take-up herein claimed. These two prior take-ups do not effect therequired nicety of thread control essential to the highspeed operationof the modern dry-thread lockstitch sewing machine.

I am also aware of the prior take-up of U. S. Patent No. 1,941,942 ofJan. 2, 1934, but this take-up embodies a reciprocatory slide to carryone of two differentially movable take-up elements and is not perfectlybalanceable. Furthermore, it is designed for use with a wax-threadhooked-needle lock-stitch sewing machine of the shoe-sole sewing typewhich runs at a comparatively low speed.

I do not claim any of the constructive features of the prior take-upsdiscussed above.

Having thus set forth the nature of the invention what I claim hereinis:

1. A compound rotary take-up for sewing machines having, in combination,a rotary carrier, a circularly moving primary thread take-up elementcarried thereby, a planet-wheel journaled in said carrier, athread-controller actuated by said planet-wheel, and a stationarysun-wheel connected to operate said planet-wheel by rotation of saidcarrier.

2. In a sewing machine, a thread-controlling element, a carrier having abearing in which said thread-controlling element is journaled, means torotate said carrier about an axis offset from the axis of said bearing,means to rotate said controlling element at a uniform angular veloc ityin said bearing, and a second thread take-up element carried by saidcarrier.

3. A compound rotary take-up for sewing machines comprising, incombination, a rotary thread-controlling element, one-toonesunand-planet gearing for actuating said element, said gearing includinga planet member and a rotary carrier therefor, and a rotary take-upelement fixed to said rotary carrier.

4. In a sewing machine, a rotary thread-controlling member, a bearingtherefor, carrier means to move said bearing around a field, means torotate said member relative to its bearing at a uniform angularvelocity, and a rotary thread take-up member fixed relative to saidcarrier means.

5. A sewing machine thread take-up device comprising, a pair of rotaryshafts having spaced parallel axes, rotary means to carry one shaftabout the axis of the other shaft, means to continuously rotate said oneshaft about its own axis and relative to said rotary means, and twothread-engaging elements carried, respectively, by said shafts.

6. A compound rotary take-up for sewing machines having, in combination,a primary shaft, a primary thread-engaging member carried thereby andtraversing a path concentric with said shaft, a secondary shaftjournaled eccentrically to said primary shaft and carried by the latter,a secondary thread-engaging element carried by said secondary shaft, andmeans to continuously and unidirectionally rotate said secondary shaftabout its own axis as said axis is carried around a field by rotation ofsaid primary shaft.

7. A sewing machine thread take-up device comprising, a continuouslyrotating primary thread-engaging element, a secondary threadengagingelement continuously rotatable in one direction about an axis spacedfrom the axis of rotation of said primary thread-engaging element, andmeans to carry the axis of rotation of said secondary thread-engagingelement around a field.

8. A sewing machine thread take-up device comprising, a continuouslyrotating primary thread-engaging element, a secondary threadengagingelement continuously rotatable in one direction about an axis spacedfrom the axis of rotation of said primary thread-engaging element, andmeans to carry the axis of rotation of said secondary thread-engagingelement around a circular field the center of which lies in the axis ofrotation of said primary thread-engaging element.

9. A compound rotary take-up device for sewing machines having, incombination, two spaced parallel shafts, a bearing for one of saidshafts, means to rotate said bearing about the axis of the other shaft,thread-engaging elements carried. respectively, by said shafts, andmeans to unidirectionally drive said shafts in timed relation to oneanother.

10. A take-up device for sewing machines having, in combination, aprimary thread-engaging device, means to move said device in a circularpath, a secondary movable thread-engagin vice, epicycloidal gearing forimparting an epitrochoidal movement to the latter, and means'to uide athread relative to said primary and secondary devices for theirconcomitant action thereon.

11. A compound rotary take-up device for sewing machines comprising, astationary sungear, a planetary gear meshing with said stationarysun-gear, a carrier for said planetary gear, a primary thread-engagingelement fixed relatively to said carrier, and a secondarythread-engaging rotate said auxiliary thread-engaging element in acircular path in said first-mentioned bearing.

13. In a sewing machine, in combination, a thread-controller, a bearingtherefor, a rotary carrier for said bearing, a bearing for said rotarycarrier axially offset from said first mentioned bearing, a threadtake-up element carrried by said carrier, means to continuously rotatesaid carrier in said last mentioned bearing, and means to continuouslyrotate said thread-controller in and relative to said first mentionedbearing, said take-up element and controller being relatively timed eachto execute one complete rotation in its respective bearing in the sametime interval.

14. A sewing machine thread take-up device comprising, two rotary cranktake-up elements, relatively offset bearings therefor, means to carryand so move one of said bearings that its axis travels in an orbitaround the axis of the other bearing, and means to unidirectionallyrotate each take-up element in its respective bearing.

15. A sewing machine having a frame including a bed and an overhangingbracket-arm terminating in a head, a reciprocatory needle-bar journaledin said head, a needle-bar-operating shaft Journaled in saidbracket-arm, said head being formed with a circular recess, aneedle-thread take-up device including a casing fitted to said circularrecess, a shaft journaled in said casing and carrying a disk havingthread take-up means journaled therein and means for removing saidcasing and take-up means from said head as a unit.

16. A rotary take-up for sewing machines comprising, a primary shaft, adisk carried thereby and concentric therewith, a take-up element fixedlypositioned on said disk, a secondary shaft Journaled in said disk inparallelism with and spaced from the axis of said primary shaft, athread-controller carried by said secondary shaft, a gear on saidsecondary shaft, and an externally toothed stationary gear coaxial withsaid primary shaft and operatively connected with said firstmentionedgear.

17. A compound rotary take-up for sewing machines having, incombination. a pair of spaced disks, and circularly moving primary andepitrochoidally moving secondary take-ups running in the space betweensaid disks.

18. In a compound rotary take-up for sewing machines, the combinationwith a circularly movable thread-engaging member, of an apitrochoidallymovable thread-engaging member, and means to guide a thread to saidmembers for their concomitant action thereon.

19. In a compound rotary take-up for sewing machines, the combinationwith a circularly movable thread-engaging member, of an epitrochoidallymovable thread-engaging member, arranged to circumscribe a field aboutthe axis oi revolution of said circularly movable take-up'member.

20. A compound rotary take-up for sewing machines having, incombination, a stationary sungear, a planet gear, means to revolve saidplanetgear about the axis of said sun-gear. a driving connection betweensaid sun and planet-gears for revolving the latter about its own axis intimed relation with its period of revolution about the axis of saidsun-gear, a thread-controlling mem-- ber secured to said planet-gear andoffset from the axis of the latter, a thread-engaging member movablecircularly about the axis of said sungear, and means to guide a threadto said threadengaging members for their Joint action thereon.

21. A compound rotary take-up for sewing machines having, incombination. a stationary sungear, a planet-gear, means to revolve saidplanetgear about the axis of said sun-gear, a driving connection betweensaid sun and planet-gears for revolving the latter about its own axis intimed relation with its period of revolution about the axis of saidsun-gear, a thread-controlling member secured to said planet-gear andoffset from the axis of the latter, means for adjusting said controllingmember relative to said planetgear, a thread-engaging member movablecircularly about the axis of said sun-gear, and means to guide a threadto said thread-engaging members for their Joint action thereon.

22. A rotary thread take-up for sewing machines having, in combination,a primary threadengaging member rotatable about a primary axis,

a secondary thread-engaging member, and means form angular velocitiesabout their respective axes, including means to carry one of said axesabout a field.

24. A take-up for sewing machines having a reciprocatory needle and arotary hook formed with a looping seizing beak comprising primarythread-engaging members which are adapted to pull the needle-thread-loopfrom the beak of the hook and set the stitch, a secondarythread-engaging member, and means to vary the timing of the secondarythread-engaging member relative to the primary thread-engaging membersto thereby control the time at which the primary thread-engaging membersbecome eflective to begin to pull the needle-thread loop from the beakof the hook.

25. A sewing machine having'in combination, an eye-pointed needle, arotary hook cooperating with said needle, means for actuating saidneedle and hook, rotary take-up elements for pulling the thread-loopfrom the hook and setting the stitch, a rotary thread-engaging member,and

means to vary the timing of said thread-engaging member relative to saidrotary take-up elements for controlling the point in the stitchformingcycle at which the pulling action of th take-up begins.

26. In a sewing machine having a reciprocat- .ing needle and aloop-taker cooperating thereing the timing of said controlling memberrelative to the thread-engaging elements to thereby control the time atwhich the thread-engaging elements will begin their take-up action.

27. In a sewing machine having a reciprocating needle and a loop-takercooperating therewith to produce lock-stitches the combination of,rotary thread-engaging elements for taking up the needle-loop after itis cast oil! by the looptaker and drawing the thread up to set thestitch and a controlling member for determining the time at which thethread-engaging elements will begin their take-up action, and means foradjusting the control member to vary the time at which the take-upaction begins.

28. A take-up for a sewing machine comprising, a member rotatable aboutan axis, take-up elements carried thereby, a gear fixed to the machinewith its central point in line with the axis about which the memberrotates, a thread-controller carried by said member, a gear secured tosaid thread-controller and meshing with the first mentioned gear. andmeans for adjusting said controller relative to said last mentionedgear.

29. In a compound rotary take-up for sewing machines the combinationwith a circularly movable thread-engaging member, of an epitrochoidallymovable thread-engaging member, means to guide a thread to said membersfor their combined action thereon, and means for shifting the path ormovement of the epitrochoidally movable member relative to thecircularly movable member.

JOHN D. KARLE.

